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#

# Copyright (c) 2008 Jakub Jermar

# Copyright (c) 2005-2006 Martin Decky

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

# - Redistributions in binary form must reproduce the above copyright

#   notice, this list of conditions and the following disclaimer in the

#   documentation and/or other materials provided with the distribution.

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

#

# Init code for application processors.

#

#include <arch/boot/boot.h>

#include <arch/boot/memmap.h>

#include <arch/mm/page.h>

#include <arch/pm.h>

#include <arch/cpu.h>

#include <arch/cpuid.h>

.section K_TEXT_START, "ax"

#ifdef CONFIG_SMP

.global unmapped_ap_boot

# This piece of code is real-mode and is meant to be alligned at 4K boundary.

# The requirement for such an alignment comes from MP Specification's STARTUP

# IPI requirements.

.align 4096

unmapped_ap_boot:

.code16

	cli

	xorw %ax, %ax

	movw %ax, %ds

	lgdtl ap_gdtr		# initialize Global Descriptor Table register

	movl %cr0, %eax

	orl $1, %eax

	movl %eax, %cr0		# switch to protected mode

	jmpl $gdtselector(KTEXT32_DES), $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET

jump_to_kernel:

.code32

	movw $gdtselector(KDATA_DES), %ax

	movw %ax, %ds

	movw %ax, %es

	movw %ax, %ss

	movw $gdtselector(UDATA_DES), %ax

	movw %ax, %gs

	# Enable 64-bit page transaltion entries - CR4.PAE = 1.

	# Paging is not enabled until after long mode is enabled

	movl %cr4, %eax

	btsl $5, %eax

	movl %eax, %cr4

	leal ptl_0, %eax

	movl %eax, %cr3

	# Enable long mode

	movl $EFER_MSR_NUM, %ecx	# EFER MSR number

	rdmsr				# Read EFER

	btsl $AMD_LME_FLAG, %eax	# Set LME=1

	wrmsr				# Write EFER

	# Enable paging to activate long mode (set CR0.PG=1)

	movl %cr0, %eax

	btsl $31, %eax

	movl %eax, %cr0

	# At this point we are in compatibility mode

	jmpl $gdtselector(KTEXT_DES), $start64 - BOOT_OFFSET + AP_BOOT_OFFSET

.code64

start64:

	movq (ctx), %rsp

	call main_ap - AP_BOOT_OFFSET + BOOT_OFFSET   # never returns

#endif /* CONFIG_SMP */

.section K_DATA_START, "aw", @progbits

#ifdef CONFIG_SMP

.global unmapped_ap_gdtr

unmapped_ap_gdtr:

	.word 0

	.long 0

#endif /* CONFIG_SMP */